If people are lying about their experiences in a negative review, then that is a troll. But if they're relating a true event, just not framing it in a generous or tactful matter, well that's the whole point of review sections. You put your product out there and cross your fingers.
Keep this link handy (Best set it to 1w or 1m), and watch it for the next weeks; We'll see how Sansar's Steam usage develops. It's off to a 'strong' start.
'Strong' in the sense that it's the new VR thing on steam and of course thus beats out a couple of the others.